Update to Chromium revision d483fb77 (#474934)

- CefLifeSpanHandler::OnBeforePopup is now called on the UI thread.
- Remove CefBrowserSettings.javascript_open_windows which is no
  longer supported.

tests/cefclient/browser/browser_window_std_gtk.cc

@@ -102,7 +102,8 @@ void BrowserWindowStdGtk::GetPopupConfig(CefWindowHandle temp_handle,
                                          CefWindowInfo& windowInfo,
                                          CefRefPtr<CefClient>& client,
                                          CefBrowserSettings& settings) {
-  // Note: This method may be called on any thread.
+  CEF_REQUIRE_UI_THREAD();
+
   // The window will be properly sized after the browser is created.
   windowInfo.SetAsChild(temp_handle, CefRect());
   client = client_handler_;